Quelpr
2 marksAspects of Biochemistry

CAPE Biology Unit 1 · 2008 · Paper 2 · Question 1(b)(i)

Keratin, a protein found in hair, is made up of α helices.

Describe the α helix bond in keratin.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)Using an α-1-6 linkage, attach a third glucose molecule in Figure 1.[2 marks]
  2. 1(a)(ii)Name ONE example of a carbohydrate that is made up of components with BOTH an α-1-4 glycosidic linkage and an α-1-6 linkage.[1 mark]
  3. 1(a)(iii)Distinguish between an 'α glycosidic linkage' and a 'β linkage'.[1 mark]
  4. 1(a)(iv)Comment on the difference in function between a carbohydrate with α linkages and a carbohydrate with β linkages.[2 marks]
  5. 1(b)(ii)Comment on TWO differences in physical properties of these proteins. Write your answer in the table below.[2 marks]
  6. 1(b)(iii)Identify the TWO bonds labelled A and B as shown in Figure 2.[2 marks]
  7. 1(c)Outline an experiment to determine experimentally the presence of catalase in chick peas.[3 marks]

More practice: the rest of this paper · more Aspects of Biochemistry questions · all CAPE Biology Unit 1 past papers